12/13/06: The Thirteenth Tipping Point

Salt Lake City, UT – British scientist John Schellnhuber has identified 12 tipping-points that, if triggered, would likely initiate sudden changes across the planet. From the deforestation of the Amazon to the melting of the West Antarctic Ice Sheet, each is tied into a global environmental system that could experience a catastrophic domino effect. Journalist Julia Whitty joins Doug with details of Schellnhuber's findings, and to explain the one factor that could change the tide.